构造应力对布沼坝露天矿西帮变形的影响

Effect of tectonic stress on west slope deformation in Buzhaoba Open-pit Mine

为了研究布沼坝露天矿西帮边坡长期变形滑移的主要原因,对矿区的地质构造进行了分析,找出了造成边坡持续变形的主要动力源,根据构造区划,给出了布沼坝矿区的主应力方向为E33°S,开挖降段造成不平衡应力的持续卸荷,导致临空面岩石圈持续变形、滑移,断层成为控制边坡稳定和滑坡的关键因素,2种基本的失稳模式分别为沿着断层或结构面顺层切出,和从滑体内部搜索最弱抗剪面滑出。

In order to study the main reason of long-term west slope deformation in Buzhaoba Open-pit Mine, the author analyzes the geological structure of mining area, and finds out the main power source of causing slope continuous deformation. According to the tectonic zone, the principal stress direction is given for E33° S in Buzhaoba mining area. Excavation and descending portion causes the continuous unloading of imbalance stress, which leads to the surface lithosphere deformation and sliding continuously.The fault becomes the key factor to control the slope stability and landslide, and two basic slide modes are respectively along the fault or structure surface cutting out or sliding out from the weakest shear face in sliding body.